Chicago Mercantile Exchange

Associated Press

Employees of the Chicago's Mercantile Exchange sort trading cards after leaving their building at 30 S. Wacker. The Merc suspended trading for the day at 9:15 a.m. following the World Trade Center attack in New York.

Employees of the Chicago's Mercantile Exchange sort trading cards after leaving their building at 30 S. Wacker. The Merc suspended trading for the day at 9:15 a.m. following the World Trade Center attack in New York. (Associated Press)

Employees of the Chicago's Mercantile Exchange sort trading cards after leaving their building at 30 S. Wacker. The Merc suspended trading for the day at 9:15 a.m. following the World Trade Center attack in New York.